Patent
1994-10-28
1997-11-11
Treat, William M.
395875, 395876, 395733, G06F 1314
Patent
active
056873956
ABSTRACT:
A system for transferring data between main memory and an input/output device in a computer system, where device driver software stores an address of a circular buffer into the device and then the device automatically transfers data to or from the buffer. The system reduces complexity within the device by always starting the circular buffer on a page boundary, and allowing the circular buffer to be only one page long. Each time the buffer address passes either zero or half the buffer size, the system interrupts the processor to allow the driver software to transfer, to a hard disk or other area of memory, the contents of the half of the buffer that was just processed. The system further reduces complexity by transferring only eight bits of data into each word of the buffer within memory, therefore avoiding the complexity of byte packing.
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Hewlett--Packard Company
Treat William M.
Winder Patrica L.
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